Mogden Sewage Treatment Works

Thames Water October 2013 Introduction

• Presentation will focus upon • Background • Odour reduction investment & results • Mogden STW quality improvements • Operational activities • Future work Mogden background

- One of the largest sewage works in the UK
- Built between 1931 and 1935
- Serves 1.9m people
- Covers an area of 55 hectares
- Over half of the works is powered by renewable energy generated on site
- Significant investment in the last 10 years Historic odour complaints Odour reduction investment

Significant investment undertaken between 2005 and 2010

What was involved?

- Odour covers, control and abatement to:
  - East inlet screen house and west inlet area covered and odour controlled
  - Covering of SSTs & conversion to PSTs
  - Covering of 2 first fill storm tanks
  - Installation OCUs on east and west side Odour reduction results

2008 independent odour assessment was carried out to review the success of the odour abatement investment:

Assessment concluded that odour has reduced from the STW:

- by 82% compared to 2005
- by 90% compared to 2003.

Annual odour assessment carried out each year during the autumn.

2013 odour assessment currently underway. Results known by November. Mogden STW Upgrade: 2010 to 2013

- Completed in April 2013
- Extended treatment capacity by 50 per cent
- Odour abatement of new inlet work and primary tanks
- Covering of the existing rectangular west side primary tanks
- Significant reduction in use of storm tanks and discharges to the Thames
- Communications reaching 10,000 residents
- Project value £140m Mogden STW upgrade 2010 - 2013 Mogden. Use of storm tanks graph.

Jan to June 2013 Operational activities

• Odour monitors • Joint TW/LBH site inspections • Dedicated phone line • Residents meetings • Webpage Future

• Complete western embankment landscaping • Continue reviewing odour emissions and abatement • Working with the community • Appraising ways to capture more renewable energy • ‘Bin it don’t block it’ campaign • Continue support for Sustainable Urban Drainage Schemes Questions ? How Mogden Works